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Definition

SQL is a structured query language designed to retrieve and manage data in relational database.


There are four basic SQL operations 


SELECT –  selects data from database tables.

UPDATE –  updates existing data into database tables.

INSERT –    inserts new data into database tables.

DELETE –  deletes existing data from database tables.


image source : (techskill)



Simple Examples of SQL query:

SELECT

SELECT * FROM Users;

UPDATE

UPDATE Users
SET name="Nimal"
WHERE userID=1;

INSERT

INSERT INTO table_name(colum1,colum2)
VALUES (value1,value2);

DELETE

DELETE 
FROM Users
WHERE userID=1;



You can work with SQL when installing database software .

Free Database Software